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Temp gauge bounces from half to hot while driving then the water in the coolant jug is boiling wen i shut it off. Could it be head gasket

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It could be a stuck thermostat, low on coolant, radiator fan not coming on, bad fan relay or fan temp sensor, or bad radiator cap.
Hope this helps.

Posted on Apr 05, 2015

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  • Contributor
  • 7 Answers

Either a bad thermostat or a bad sensor

Posted on Apr 05, 2015

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  • Cars & Trucks Master
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Could be something as simple as a bad thermostat.

Posted on Apr 05, 2015

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SOURCE: 03 elantra 2.0l boil over...head gasket ?

thermostat

Posted on Sep 12, 2008

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SOURCE: car runs hot

CHECK YOUR RELAY IN YOUR FUSE BOX UNDER THE HOOD ON THE DRIVERS SIDE INNER FENDER. THE A/C AND THE HEATER RELAY ARE SAME. CHECK AND SEE IF THE A/C REALY WORKS BY TURNING ON YOUR A/C SWITCH. THE ELECTRIC FAN SHOULD START RIGHT AWAY. OTHERWISE YOU HAVE TO WAIT TILL THE ENGINE ACHEIVES OPERATING TEMP TO KICK THE FAN ON. IF ONE DON'T WORK AND OTHER OTHER DOES... SWITCH THE RELAY AND SEE IF IT WORKS. BEEN THERE AND DONE THAT. $9.00 FOR A NEW RELAY AT CHECKER AUTO PARTS.

Posted on Feb 14, 2009

  • 11 Answers

SOURCE: overheating

Is this the diesel model ? or petrol power? Never lug your diesel engine it will overheat even a new engine. Check your coolant level when engine is cooled down it may need burped. Why the head gasket change? did the head get checked for cracks and surface flatness, could be still leaking combustion pressure gases into the coolant have a test for this

Posted on Mar 11, 2009

GM Elec
  • 1000 Answers

SOURCE: my monte carlo overheats when idle but no signs of a blown head gasket nor water in oil. the temp gauge will go up to half way then the radiator fans will come on. when i'm driving it will go down to

When the engine is "over heating" are the radiator cooling fans running on high speed?

Has there been any engine work performed on the vehicle lately?

Let me know.
Regards,

Posted on May 01, 2009

hepcars
  • 1249 Answers

SOURCE: 2003 impala losing fluid in radiator and getiing hot with no leaks

Depending on mileage, many of these motors develop a leak around the intake manifold gasket...the antifreeze leak usually burns off of the hot intake before you can spot it. Most motors are worth this repair...about $350. to $450. at your nearby shop. It is a good sign that the motor temperature stays cool when it has adequate coolant. You did not mention seeing any milky color on your oil check dipstick...that is a sign the head gasket is leaking...a much more costly repair...Your least costly repair could be a defective radiator cap...free pressure tests at you local parts store. Hope this helps.

Posted on Apr 03, 2012

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1 Answer

My 2004 model ford bantam always getting hot when am driving would u answer me any one now this please ?


Many possibilities, first check water/coolant level, check for leaks after running engine for about 10 mins, or sitting overnight, then check radiator air flow is not restricted, and fins are in reasonable order, check fan, make sure it cuts in before engine gets to hot, check if there is water in the oil (looks creamy) or oil in the water, if so you need a head gasket and/or a new head. flush engine block with high pressure water in reverse flow direction, then check thermostat, use thermometer, put in a pot of water temp, is stamped on body of thermostat, if not, bring to boil, should open well before boiling point, replace if needed, check water pump fins are not worn away. get specialist to use lazer temp gauge.

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2 blocks is fast to reach boiling.Take the cap off the overflow tank and fill it right to the very top with coolant.Start the car and watch for a steady stream of bubbles.If you see a steady stream you do need a head gasket or have a crack somewhere in a combustion camber.

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92' Ford Explorer is running hot. Changed the thermostat, water-pump and flushed out cooling system. The coolant is boiling in the radiator, and overflowing out of the coolant reservoir.


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Overheating


Is this the diesel model ? or petrol power? Never lug your diesel engine it will overheat even a new engine. Check your coolant level when engine is cooled down it may need burped. Why the head gasket change? did the head get checked for cracks and surface flatness, could be still leaking combustion pressure gases into the coolant have a test for this

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